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To perform maintenance on Ceph that brings Ceph down, all VMs must be stopped beforehand and restarted after maintenance has been finished.

Prerequisite

Have the following command line tools available:

• bash
• curl
• jq
• xargs

As an admin user, create an API key and store it to ADMIN_APIKEY environment variable. E.g. export ADMIN_APIKEY=x4g...

Store the API hostname to API_HOST environment variable. E.g. export API_HOST=api.pilw.io

Step by Step Guide

Mark all hypervisors as not accepting workloads so no new resources can be created.

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cat running_vms.json | jq -r '.[]|.uuid' | \
xargs -n 1 -I {} curl -X POST -H "apikey: $ADMIN_APIKEY" https://$API_HOST/v1/.../stop -d uuid={}

Not all VMs might agree to stop. These must be stopped forcefully.

It is now safe to perform maintenance and bring Ceph offline.

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